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Bibliografias temáticas / Electromagnetism – materials

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Literatura científica selecionada sobre o tema "Electromagnetism – materials"

Autor: Grafiati

Publicado: 25 de julho de 2024

Última modificação: 31 de julho de 2024

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Artigos de revistas sobre o assunto "Electromagnetism – materials"

1

Xiong, Guang Jie, e Ling Li. "Finite Element Analysis of Electromagnetic Device in Magnetorheological Fluid Brake". Applied Mechanics and Materials 268-270 (dezembro de 2012): 1448–52. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1448.

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Magnetorheological fluid (MRF) Brake is a newly-developed intelligent brake in which traditional mechanical brake friction pairs are replaced by MRF materials and the electromagnetism devices are very important components. The controllable magnetic fields are generated by electromagnetism devices which can make MRF materials create related braking torque to control the braking performance of the MRF Brake. In this paper, the electromagnetism device consists of several coil sets which can generate electromagnetic fields for MRF Brake. By using finite element analysis, the magnetic fields generated by electromagnetism devices are compared analytically under the different conditions, and then the optimum parameters are obtained such as coil arrangements, excitation currents and air gap distances and etc. All these evidences are helpful to design the structure of electromagnetism devices in MRF Brake.

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2

Ciarlet Jr., Patrick, François Lefèvre, Stéphanie Lohrengel e Serge Nicaise. "Weighted regularization for composite materials in electromagnetism". ESAIM: Mathematical Modelling and Numerical Analysis 44, n.º 1 (3 de novembro de 2009): 75–108. http://dx.doi.org/10.1051/m2an/2009041.

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3

Nicolet, A., F. Zolla, Y. Ould Agha e S. Guenneau. "Geometrical transformations and equivalent materials in computational electromagnetism". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, n.º 4 (11 de julho de 2008): 806–19. http://dx.doi.org/10.1108/03321640810878216.

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PurposeThis paper aims to review various techniques used in computational electromagnetism such as the treatment of open problems, helicoidal geometries and the design of arbitrarily shaped invisibility cloaks. This seemingly heterogeneous list is unified by the concept of geometrical transformation that leads to equivalent materials. The practical set‐up is conveniently effected via the finite element method.Design/methodology/approachThe change of coordinates is completely encapsulated in the material properties.FindingsThe most significant examples are the simple 2D treatment of helicoidal geometries and the design of arbitrarily shaped invisibility cloaks.Originality/valueThe paper provides a unifying point of view, bridging several techniques in electromagnetism.

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4

Zhang, Zidong, Yaman Zhao, Guohua Fan, Wenjin Zhang, Yao Liu, Jiurong Liu e Runhua Fan. "Paper-based flexible metamaterial for microwave applications". EPJ Applied Metamaterials 8 (2021): 6. http://dx.doi.org/10.1051/epjam/2020016.

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Metamaterial has become a hotspot in many research fields, including electromagnetism, thermodynamics and mechanics, as it can offers additional design freedom for material to obtain novel properties. Especially for the electromagnetic devices, various interesting electromagnetic properties which cannot be found in nature materials can be realized, such as negative refraction, invisible cloak, etc. Herein, we provide an overview of paper-based metamaterial for microwave application. This work reviews the metamaterial realized on paper substrate, including the fabrication techniques, application fields, as well as the outlook on future directions of the paper-based metamaterial for the readership.

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5

Achille Ecladore, Tchahou Tchendjeu, Yungho Edickson Bobo e Nfah Eustace Mbaka. "Design and Realization of a Controlled Electromagnetic Breaking System". Journal of Engineering 2023 (14 de agosto de 2023): 1–12. http://dx.doi.org/10.1155/2023/1426506.

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Industrial machines with sharp moving blades are extremely dangerous to workers. These machines often rotate for some time (called the run-down time) before completely stopping due to little or no brakes. In the case where brakes are used, they are mechanical in nature and are associated with problems of wear out and frequent maintenance among others. In this paper, we proposed a mathematical model and implementation of an electromagnet and design and construction of a mechanical support frame and a controller for the electromagnetic braking system. The electromagnetic braking system works on the principle of electromagnetism. To realize the semicircular electromagnets, we coil the gauge wires several times around a ferromagnetic core material. The electromagnet was connected to a 12 V 7 Ah battery and was used to lift a load whose mass and corresponding weight were predetermined using a scale balance. The magnetic force generated was equal to the amount of maximum load it could lift. The mechanical frame, on which the electromagnets, motor, battery, switches, and chain drive system were mounted, was designed using SolidWorks and constructed by measuring, cutting, and joining of iron materials. A microcontroller and a power MOSFET were used in the control circuit to drive the electromagnet. Major results such as the realized electromagnets and the magnitude of the electromagnetic force (1.43 N) produced by the electromagnets are presented. The mechanical frame and the control circuit are also presented. The braking force was greater than the rotation torque of the disc, and hence braking was achieved.

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6

Luo, Zhi Ping, Chao Liu e Ma Ji Luo. "Study on Skin Effect in PEMFC with Dynamic Current". Advanced Materials Research 347-353 (outubro de 2011): 3246–50. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3246.

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The main materials of polymer electrolyte membrane fuel cell (PEMFC) are carbon (C) and Stainless Steel (Fe). The dynamic current of PEMFC will cause nonuniform distribution of current density in these materials. Simple models which materials are carbon (C) and Stainless Steel (Fe) are used in testing. A testing device using electromagnetic method was set up to detect the induced electromotive force in models. Theoretical calculations using electromagnetism and mathematics are set up to calculate the current density distribution of models. It is shown from the comparison between calculated values of the formula and measured values that the dynamic current of PEMFC will cause skin effect.

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7

Boller, C., I. Altpeter, G. Dobmann, M. Rabung, J. Schreiber, K. Szielasko e R. Tschuncky. "Electromagnetism as a means for understanding materials mechanics phenomena in magnetic materials". Materialwissenschaft und Werkstofftechnik 42, n.º 4 (abril de 2011): 269–78. http://dx.doi.org/10.1002/mawe.201100761.

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Dmitriyev, Valery P. "Elasticity and Electromagnetism". Meccanica 39, n.º 6 (dezembro de 2004): 511–20. http://dx.doi.org/10.1007/s11012-004-6057-8.

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9

Lohrengel, Stephanie, e Serge Nicaise. "SINGULARITIES AND DENSITY PROBLEMS FOR COMPOSITE MATERIALS IN ELECTROMAGNETISM". Communications in Partial Differential Equations 27, n.º 7-8 (7 de janeiro de 2002): 1575–623. http://dx.doi.org/10.1081/pde-120005849.

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10

Dobrzynski, Léonard. "Interface response theory of electromagnetism in composite dielectric materials". Surface Science Letters 180, n.º 2-3 (fevereiro de 1987): A57. http://dx.doi.org/10.1016/0167-2584(87)90216-7.

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Teses / dissertações sobre o assunto "Electromagnetism – materials"

1

O'Dell, Ryan Andrew. "Resonant Ferromagnetic Absorption and Magnetic Characterization of Spintronic Materials". University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1533043360679487.

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2

Myers, Joshua Allen. "Nano-scale RF/Microwave Characterization of Materials' Electromagnetic Properties". Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1340883872.

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3

Ciracì, Cristian. "Study of second-harmonic generation in nonlinear nanostructured materials". Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20053.

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Au cours de ces 20 dernières années, une attention particulièrement soutenue a été donnée à l'étude et à la fabrication de matériaux nano-structurés permettant le contrôle de la lumière. Cependant, les propriétés de non-linéarité optique de ces nouveaux matériaux n'ont que très peu été explorées. Partant de ce constat, cette thèse se propose de pourvoir cette insuffisance. L'accent est mis en particulier sur le processus de génération de seconde harmonique à travers deux aspects fondamentaux: (i) le contrôle de l'émission de seconde harmonique pour des matériaux nano-structurés non-linéaires et (ii) l'augmentation de conversion dans des dispositifs photoniques intégrés. Nous présentons un nouveau phénomène de localisation non-linéaire qui a lieu dans des matériaux main-gauche et qui implique un accord de phase isotrope. Nous démontrons analytiquement le processus de localisation dans un milieu homogène main-gauche, avant de mettre en évidence un tel effet dans des cristaux photoniques non-linéaires à l'aide de simulations numériques. L'effet de localisation contra-propagative du second harmonique est utilisé pour le design d'une lentille de second-harmonique. Ce résultat théorique a été démontré numériquement pour une structure réalisable fonctionnant aux fréquences optiques. L'augmentation de génération de seconde harmonique constitue l'aspect complémentaire. En tirant parti de la forte localisation de lumière dans une chaîne de nano-tiges de dimension finie, nous montrons que, pris ensemble, le confinement transverse sub-longueur d'onde et la condition de résonance d'accord de phase contribuent de manière importante à l'augmentation de la génération de seconde harmonique. Les capacités de guidage sub-longueur d'onde de chaînes de nano-tiges sont mis en évidence en examinant leurs propriétés de propagation linéaire. Pour finir, nous nous penchons sur la condition d'accord de phase assurant l'interaction non-linéaire optimale
The past twenty years have been exceptionally rich on the study and fabrication of nanostructured materials to control light, but no much attention was given to nonlinear optical properties of these novel materials. In this context, the present thesis would partially address this gap. In particular, we focus on the second-harmonic generation process, by considering two fundamental aspects: the second-harmonic emission control by means of nanostructured nonlinear materials and the conversion enhancement in integrated photonic devices. A novel nonlinear localization phenomenon occurring in left-handed materials and involving isotropic phase-matching is presented. We analytically demonstrate the localization process in a homogenous left-handed material and by numerical simulation we show the effect for nonlinear photonic crystals. The backward second-harmonic localization effect is used to design a second-harmonic lens. This interesting theoretical result is numerically shown for a feasible structure working at optical frequencies. The second-harmonic generation enhancement is the complementary aspect. By taking advantage of the strong light localization achieved in finite size dielectric nonlinear nanorod chains, we show that sub-wavelength transversal confinement, together with the resonant phase-matching condition, adds an important property to the second-harmonic generation enhancement. A study of linear propagation properties of nanorod chain structures first evidences its sub-wavelength guiding capabilities. Finally, the phase-matching condition that assures the maximal nonlinear interaction in this kind of structure is presented

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4

Meyendorf, Robert. "Nondestructive Determination of Case Depth in Surface Hardened Steels by Combination of Electromagnetic Test Methods". University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1303834395.

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5

Parsa, Nitin. "MILLIMETER-WAVE FARADAY ROTATION FROM FERROMAGNETIC NANOWIRES AND MAGNETOELASTIC MATERIALS". University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1561468969375731.

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6

Vishal, Kumar. "Nonreciprocal magnetostatic surface wave in thin ferromagnetic film". Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1472018768.

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7

Kung, Christopher W. "Development of a time domain hybrid finite difference/finite element method for solutions to Maxwell's equations in anisotropic media". Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1238024768.

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8

Roberts, Anthony M. "Implementing a Piezoelectric Transformer for a Ferroelectric Phase Shifter Circuit". Cleveland State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=csu1337025849.

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9

Chung, Jae-Young. "Broadband Characterization Techniques for RF Materials and Engineered Composites". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1269542888.

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10

Hansen, Matthew Martin Kenneth. "Optimization of Conformal Joints in Axial Tension". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1355847865.

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Mais fontes

Livros sobre o assunto "Electromagnetism – materials"

1

Tong, Colin. Advanced materials and design for electromagnetic interference shielding. Boca Raton: Taylor & Francis, 2009.

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2

Singapore), International Conference on Materials for Advanced Technologies (2003. Proceedings of the Symposium F: Electromagnetic materials : SUNTEC, Singapore, 7-12 December 2003. New Jersey: World Scientific, 2003.

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3

Solymar, L. Waves in metamaterials. Oxford: Oxford University Press, 2009.

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4

N, Venevt͡s︡ev I͡U︡, Li͡u︡bimov V. N, Akademii͡a︡ nauk SSSR. Otdelenie fiziko-khimii i tekhnologii neorganicheskikh materialov. e Nauchno-issledovatelʹskiĭ fiziko-khimicheskiĭ institut im. L.I͡A︡. Karpova., eds. Segnetomagnitnye veshchestva: Sbornik nauchnykh trudov. Moskva: "Nauka", 1990.

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5

S, Weiglhofer Werner, e Lakhtakia A. 1957-, eds. Introduction to complex mediums for optics and electromagnetics. Bellingham, Wash: SPIE Press, 2003.

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6

V, Eleftheriades G., e Balmain K. G, eds. Negative-refraction metamaterials: Fundamental properties and applications. Hoboken, NJ: J. Wiley, 2005.

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7

Schlichting, Diane. Magnetic and charged materials. Whitby, ON: Durham Distric School Board, Program Services Curriculum, 1999.

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8

Evans, R. W. Test report-direct and indirect lightning effects on composite materials. MSFC, Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1997.

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9

George C. Marshall Space Flight Center. e United States. National Aeronautics and Space Administration., eds. Test report--direct and indirect lightning effects on composite materials. [Marshall Space Flight Center], Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1997.

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10

Evans, R. W. Test report--direct and indirect lightning effects on composite materials. [Marshall Space Flight Center], Ala: National Aeronautics and Space Administration, Marshall Space Flight Center, 1997.

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Capítulos de livros sobre o assunto "Electromagnetism – materials"

1

Dugdale, David. "Electrical properties of materials". In Essentials of electromagnetism, 169–87. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-22780-8_7.

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2

Dugdale, David. "Magnetic properties of materials". In Essentials of electromagnetism, 188–209. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-22780-8_8.

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3

Sibley, Martin J. N. "Ferromagnetic Materials and Components". In Introduction to Electromagnetism, 163–77. 2^a ed. Second edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780367462703-7.

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4

Compton, A. J. "Electric Fields in Materials". In Basic Electromagnetism and its Applications, 50–69. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-7890-7_5.

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5

Compton, A. J. "Inductance and Magnetic Materials". In Basic Electromagnetism and its Applications, 92–106. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-7890-7_8.

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6

Rosser, W. Geraint V. "Stationary dielectrics and stationary magnetic materials". In Interpretation of Classical Electromagnetism, 327–54. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-1950-6_9.

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Zohuri, Bahman. "Introduction to Electromagnetism". In Thermal Effects of High Power Laser Energy on Materials, 81–145. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63064-5_4.

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8

Liu, Yiming, Bilen Emek Abali e Victor Eremeyev. "Prediction of Dissipation in Electronic Components by Computing Electromagnetism". In Advanced Structured Materials, 369–83. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28744-2_16.

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9

Rakotomanana, Lalaonirina R. "Second Gradient Continuum: Role of Electromagnetism Interacting with the Gravitation on the Presence of Torsion and Curvature". In Advanced Structured Materials, 675–94. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72440-9_36.

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10

Ida, Nathan. "Magnetic Materials and Properties". In Engineering Electromagnetics, 525–628. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4757-3287-0_9.

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Trabalhos de conferências sobre o assunto "Electromagnetism – materials"

1

Lopez-Torres, A. M., J. Lobera, C. Sanchez-Azqueta e F. J. Torcal-Milla. "Support materials for teaching Electromagnetism". In 2022 Congreso de Tecnología, Aprendizaje y Enseñanza de la Electrónica (XV Technologies Applied to Electronics Teaching Conference (TAEE). IEEE, 2022. http://dx.doi.org/10.1109/taee54169.2022.9840597.

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2

Sánchez-Dehesa, Jose, Daniel Torrent e Jorge Carbonell. "Anisotropic metamaterials as sensing devices in acoustics and electromagnetism". In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, editado por Theodore E. Matikas. SPIE, 2012. http://dx.doi.org/10.1117/12.916043.

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Munasir, Munasir, Nurul Hidayat, Diah Hari Kusumawati, Nugrahi Primary Putri, Ahmad Taufiq e Sunaryono Sunaryono. "Amorphous-SiO2 nanoparticles for water treatment materials". In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015673.

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4

Chengchen Deng, Chengchen Deng, Min Zhu Min Zhu, Hongbo Zhao e Liao He. "A Method of Force Output Test for a Low Thrust High Precision Flat Space Electromagnetism Actuator". In International Conference on Mechanics,Materials and Structural Engineering (ICMMSE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmmse-16.2016.4.

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Berton, B. "Development of Multifunctional Materials and Structures with Improved Capacities in Aerodynamics, De-icing, Acoustics or Electromagnetism for Civil and Military Aircrafts". In I European Conference On Multifunctional Structures. CIMNE, 2020. http://dx.doi.org/10.23967/emus.2019.020.

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Muhlestein, Michael B., Benjamin M. Goldsberry, Caleb F. Sieck e Michael R. Haberman. "Analytical and Numerical Investigation of Scattering From Bianisotropic Acoustic Media". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72672.

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Scattering from fluid domains with dissimilar material properties is of foundational importance to many application areas in acoustics and elastic wave propagation. For example, biomedical ultrasound and sonar both make use of acoustic field scattering for localization, imaging, and identification of objects. The theory of acoustic scattering from fluid and elastic materials is well established and has been validated with numerical and physical experiments. Recent work in acoustic and elastic meta-materials has shown that materials with subwavelength asymmetry have a macroscopic response characterized by a scalar bulk modulus, a tensorial mass density, and a vector that couples the pressure-strain relationship with the momentum density-particle velocity relationship. This type of constitutive behavior is the acoustic analogue of bianisotropy in electromagnetism and has come to be known as Willis coupling in acknowledgement of the first description of this material response by J.R. Willis [Willis, Wave Motion 3, pp. 111 (1981)]. We present a theoretical description of acoustic scattering of a plane wave incident upon a cylinder exhibiting weak Willis coupling using a perturbation approach. The scattered field depends upon the orientation of the Willis coupling vector and is therefore anisotropic despite the symmetry of the geometry. The analytical model is validated through comparison with a finite element-based numerical experiment where the bianisotropic material response is introduced using a weak formulation of the constitutive equations.

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7

Berbyuk, Viktor. "TERFENOL-D Based Transducer for Power Harvesting From Vibration". In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34788.

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The proposed paper addresses the problem of vibration-to-electric energy conversion using giant magnetostrictive material — TERFENOL-D. Both theoretical and experimental results of the study of performance of magnetostrictive transducer which was built at Chalmers University of Technology are presented. The mathematical models have been developed for modeling of magnetostrictive transducer based on constitutive equations of magnetoelastic behavior of TERFENOL-D rod and standard formulae of electromagnetism for induced voltage and current in the pick-up coil due to variation of magnetic field. The developed models are used to evaluate induced voltage and electrical power output for displacement driven and as well as force driven transducers. Several experiments using test rig generating periodic excitations with frequency up to 1000 Hz have been conducted for newly developed physical prototype of transducer having TERFENOL-D rod with 50 mm in length and 15 mm in diameter as active material. The validity of the transducer model is illustrated by comparison simulation data with experiment. The obtained results of the study the vibration-to-electric energy conversion using TERFENOL-D have confirmed the potential of using giant magnetostrictive materials for power harvesting from vibration.

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8

Paquette, Jason W., e K. J. Kim. "Initial Assessment of Small Systems (MEMS and NEMS) Course Taught in an Undergraduate and Graduate Classroom". In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39468.

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Micro-electro-mechanical systems (MEMS) and nanotechnology are a fast developing technology which combines very small mechanical structures with microelectronics circuits. These devices range in scale from nanometers (10−9 m) to several millimeters, and they are fabricated using the established techniques of microelectronics construction. Due to the increasingly large size and opportunities in these fields, it is becoming necessary to offer course work with small systems for students at the undergraduate and graduate level. A course in MEMS/NEMS small systems was taught at the University of Nevada, Reno in the spring of 2002. The course used the text written by Hsu [1] along with supplementary material. Problems and examples of applying fundamental principles from mechanics, electromagnetism, thermodynamics and optics among others to problems in MEMS design, fabrication and actuation were considered. The course is primarily designed to introduce both engineering undergraduate and graduate students to the possibilities of this exciting new engineering field. Also, current MEMS, NEMS, and microfluidic applications, such as sensors, actuators, heat exchangers, and chemical/biological analysis systems, were discussed. The course introduced a broad spectrum of topics related to small system development including basic engineering science for small system design, engineering mechanics, thermofluid engineering, scaling laws, materials for small systems, fabrication technologies, small system design, advanced nano-materials (molecular motors, nanotubes, polymer nanocomposites), standard characterization techniques: SEM, TEM, AFM, and applications (MEMS, NEMS and microfluidics).

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9

Niamien, C., S. Collardey, A. Sharaiha e K. Mahdjoubi. "Surface wave loss and material loss in printed antennas over magneto-dielectric materials". In the American Electromagnetics Conference (AMEREM). IEEE, 2010. http://dx.doi.org/10.1109/antem.2010.5552498.

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10

Kemerling, Brandon, e Daniel Ryan. "Development of Production Eddy Current Inspection Process for Additively Manufactured Industrial Gas Turbine Engine Components". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90971.

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Abstract While metal additive manufacturing (AM) promises substantial efficiency gains to the gas turbine manufacturing sector, uncertainty about the quality of parts produced via AM has been a significant hindrance to widespread implementation. Although high fidelity inspection techniques involving computed tomography (CT) and destructive testing have been effective for low volume development activities, new quality assurance solutions are needed that enable rapid, low-cost inspection of serial production AM components. Solar Turbines Incorporated is actively engaged in the development of inspection processes for high production volume AM part acceptance capability of combustion and turbine hot section components. Eddy current inspection (ECI) was identified as a potential non-destructive evaluation (NDE) solution. Based on the principles of electromagnetism, ECI has been successful on conventional materials for surface and near-surface crack detection. However, limited industry data is available regarding the effectiveness of ECI on AM material. The nature of AM-induced discontinuities, specifically for metal laser powder bed fusion (L-PBF) processing, demands high measurement resolution to detect fine features such as bulk porosity, lack of fusion and interlayer discontinuities. Development activities were thus executed to determine the suitability of ECI for detection of AM discontinuities. NDE training sets were printed with intentional variations in key L-PBF processing parameters to simulate the conditions which produce relevant AM material discontinuities. The training sets were then evaluated with a custom ECI system to determine the inspection capability and sensitivity. Inspections were conducted as a function of multiple input frequencies to determine the optimal tradeoff between measurement resolution and depth of penetration. Additional characterization of the training sets was conducted via metallographic analysis to establish correlations between the ECI results and AM material quality. An optimized multi-frequency inspection setting was identified to provide suitable measurement resolution for near surface AM material inspection. Correlations developed between ECI scan data and materials characterization results have enabled the ability to rapidly discriminate between varying discontinuity levels in AM components. Based on these efforts, ECI is considered a suitable inspection technique for materials produced via the L-PBF AM process.

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Relatórios de organizações sobre o assunto "Electromagnetism – materials"

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Dahal, Sachindra, e Jeffery Roesler. Passive Sensing of Electromagnetic Signature of Roadway Material for Lateral Positioning of Vehicle. Illinois Center for Transportation, novembro de 2021. http://dx.doi.org/10.36501/0197-9191/21-039.

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Autonomous vehicles (AV) and advanced driver-assistance systems (ADAS) offer multiple safety benefits for drivers and road agencies. However, maintaining the lateral position of an AV or a vehicle with ADAS within a lane is a challenge, especially in adverse weather conditions when lane markings are occluded. For significant penetration of AV without compromising safety, vehicle-to-infrastructure sensing capabilities are necessary, especially during severe weather conditions. This research proposes a method to create a continuous electromagnetic (EM) signature on the roadway, using materials compatible with existing paving materials and construction methods. Laboratory testing of the proposed concept was performed on notched concrete-slab specimens and concrete prisms containing EM materials. An induction-based eddy-current sensor and magnetometers were implemented to detect the EM signature. The detected signals were compared to evaluate the effects of sensor height above the concrete surface, type of EM materials, EM-material volume, material shape, and volume of EM concrete prisms. A layer of up to 2 in. (5.1 cm) of water, ice, snow, or sand was placed between the sensor and the concrete slab to represent adverse weather conditions. Results showed that factors such as sensor height, EM-material volume, EM dosage, types of the EM material, and shape of the EM material in the prism were significant attenuators of the EM signal and must be engineered properly. Presence of adverse surface conditions had a negligible effect, as compared to normal conditions, indicating robustness of the presented method. This study proposes a promising method to complement existing sensors’ limitations in AVs and ADAS for effective lane-keeping during normal and adverse weather conditions with the help of vehicle-to-pavement interaction.

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Thornell, Travis, Charles Weiss, Sarah Williams, Jennifer Jefcoat, Zackery McClelland, Todd Rushing e Robert Moser. Magnetorheological composite materials (MRCMs) for instant and adaptable structural control. Engineer Research and Development Center (U.S.), novembro de 2020. http://dx.doi.org/10.21079/11681/38721.

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Magnetic responsive materials can be used in a variety of applications. For structural applications, the ability to create tunable moduli from relatively soft materials with applied electromagnetic stimuli can be advantageous for light-weight protection. This study investigated magnetorheological composite materials involving carbonyl iron particles (CIP) embedded into two different systems. The first material system was a model cementitious system of CIP and kaolinite clay dispersed in mineral oil. The magnetorheological behaviors were investigated by using parallel plates with an attached magnetic accessory to evaluate deformations up to 1 T. The yield stress of these slurries was measured by using rotational and oscillatory experiments and was found to be controllable based on CIP loading and magnetic field strength with yield stresses ranging from 10 to 104 Pa. The second material system utilized a polystyrene-butadiene rubber solvent-cast films with CIP embedded. The flexible matrix can stiffen and become rigid when an external field is applied. For CIP loadings of 8% and 17% vol %, the storage modulus response for each loading stiffened by 22% and 74%, respectively.

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Hadjipanayis, George C. Magnetic Meta-Materials for Electromagnetic Applications. Fort Belvoir, VA: Defense Technical Information Center, junho de 2006. http://dx.doi.org/10.21236/ada458377.

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Ho, T. Q., J. C. Logan, J. H. Schukantz, F. W. Shaw e R. Q. Welch. Measurement of Electromagnetic Properties of Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, fevereiro de 1993. http://dx.doi.org/10.21236/ada264725.

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Taylor, Antoinette. Innovation in Materials Science: Electromagnetic Metamaterials Summary. Office of Scientific and Technical Information (OSTI), novembro de 2012. http://dx.doi.org/10.2172/1055757.

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Allen, Jeffrey, Naftali Herscovici, Brad Kramer e Bae-Ian Wu. New Concepts in Electromagnetic Materials and Antennas. Fort Belvoir, VA: Defense Technical Information Center, setembro de 2013. http://dx.doi.org/10.21236/ada591022.

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Allen, Jeffrey, Naftali Herscovici, Brad Kramer e Bae-Ian Wu. New Concepts in Electromagnetic Materials and Antennas. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2015. http://dx.doi.org/10.21236/ada614887.

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Jones, Chriss A. Stripline resonator for electromagnetic measurements of materials. Gaithersburg, MD: National Bureau of Standards, 1998. http://dx.doi.org/10.6028/nist.tn.1505.

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Banks, H. T., V. A. Bokil, D. Cioranescu, N. L. Gibson, G. Griso e B. Miara. Homogenization of Periodically Varying Coefficients in Electromagnetic Materials. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2005. http://dx.doi.org/10.21236/ada440029.

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Lieberman, A. George. Transient analysis of electromagnetic reflection from dispersive materials. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.tn.1202.

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